Differential loss of fat and lean mass in the morbidly obese after bariatric surgery.

Background: Bariatric surgery has become a common treatment for morbid obesity. The relative changes in body tissue that comprise the substantial weight loss over time are not completely understood.

Methods: We evaluated the differential rates of fat and lean tissue losses in morbidly obese patients who underwent Roux-en-Y gastric bypass surgery.

Peak oxygen consumption and the minute ventilation/carbon dioxide production relation slope in morbidly obese men and women: influence of subject effort and body mass index.

The authors evaluated the minute ventilation/carbon dioxide production relation (VE/VCO2 slope) as a complementary measure to peak oxygen consumption (peak VO2) in 76 patients (mean +/- SD age = 44.3+/-10.8 years, 69.

Caloric expenditure in the morbidly obese using dual energy X-ray absorptiometry.

Total caloric expenditure is the sum of resting energy expenditure (REE) and caloric expenditure during physical activity. In this study, we examined total caloric expenditure in 25 morbidly obese patients (body mass index>or=35 kg/m(2)) using dual energy X-ray absorptiometry (DXA) scanning and cardiorespiratory exercise testing. Our results show average REE for all individuals was 2027+/-276 kcal/d and mean net caloric expenditure during 30 min of exercise was 115+/-16 kcals.